![]() ![]() Clean benches can be used for certain clean activities, such as the dust-free assembly of sterile equipment or electronic devices, and they should never be used when handling cell culture materials or drug formulations, or when manipulating potentially infectious materials. Typical lab systems have pressure-independent supply-air terminal units and fast-acting pressure-independent exhaust-air terminal units. Explain respiratory structures encountered along the way, the functions of these structures, and changes that occur in the air as it travels through this system. ![]() These devices only provide product protection. Explain the path of air flow (oxygen) during a normal respiratory cycle, from outside the body, to the lung alveoli. Horizontal laminar flow or vertical laminar flow “clean benches” are not biosafety cabinets these pieces of equipment discharge HEPA-filtered air from the back of the cabinet across the work surface toward the user, and they may expose the user to potentially hazardous materials. Vertical flow hoods, on the other hand, provide significant protection to the user and the cell culture. The flow can be horizontal, blowing parallel to the work surface, or it can be vertical, blowing from the top of the cabinet onto the work surface.ĭepending on its design, a horizontal flow hood provides protection to the culture (if the air flowing towards the user) or to the user (if the air is drawn in through the front of the cabinet by negative air pressure inside). CCDIs new FlowTracker system provides in house Flow service for our customers with built in real time reporting AND a Quality. Laminar flow hoods protect the working environment from dust and other airborn contaminants by maintaining a constant, unidirectional flow of HEPA-filtered air over the work area.
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